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Off-grid power

Solar, batteries, generators and fuel, sized for what a household actually has to run.

2 guides

Off-grid power guides

What this section covers

Most homes do not need to run everything when the grid is down. They need a short list to keep going: a freezer or refrigerator, a well pump if they have one, a few lights, a radio, phones, and in winter the blower on a furnace or a pellet stove. Sizing a backup system starts with that list, never with a panel or a generator on sale.

This section works through the choices in the order a household meets them. First the load: what each appliance draws, which ones surge when they start, and how many hours a day each one really needs. Then the source: a fuel generator, portable power stations, rooftop or ground-mount solar with a battery bank, and the small systems that keep phones and a weather receiver charged for weeks.

Fuel is its own subject. Gasoline goes stale, propane keeps, diesel needs care, and every one of them has storage rules your fire marshal and insurer care about. Generators also kill people every year through carbon monoxide when they run in garages or near windows, and the safe distances belong in any plan.

We also cover the low-tech side that keeps a house livable on no power at all: kerosene and oil lamps burned safely indoors, cooking without electricity, keeping food cold with ice and an unopened freezer, and staying warm in one room. A good plan layers them, so a failed inverter is an inconvenience instead of an emergency.

Common questions

What size generator does a house need?
Add up the running watts of what you must power and allow for the starting surge of motors like a well pump or refrigerator. Most households find a short essential list needs far less than whole-house capacity.
Can solar keep a freezer running?
Yes, if the panels and batteries are sized for the freezer's daily use and for a few cloudy days. Stored battery power is what carries it through the night.
Is it safe to run a generator in the garage?
No. Generators produce carbon monoxide and belong outdoors, well away from doors, windows and vents, even with the garage door open.